baber/WOPTO huggingface dataset:
Patent GB-1102057-A (GB)
Title: Polish formulation
IPC: C09G1/10
Filed: 1965-12-08
Abstract: Aqueous polish formulations comprise (1) an emulsifiable polyolefin wax; (2) an acrylic interpolymer in the form of a latex of particle size not greater than 0.06 microns and of refractive index 1.47 to 1.59; (3) an alkali-soluble resin; and (4) a levelling agent comprising 8.5 to 12.7 parts by weight tributoxyethyl phosphate, 0.6 to 1.0 parts by weight of a hydrolytically-stable polysiloxane-oxyalkylene block copolymer of molecular weight below 25,000 and a polysiloxane content in the range 30 to 60% by weight, and 5.29 to 10.6 parts by weight of diethylene glycol monoethyl ether, based on 100 parts by weight of (1) and (2).  The waxes may be derived from polymers of ethylene and/or propylene, optionally together with other ethylenically unsaturated compounds.  A preferred wax is prepared by blending a pyrolysed polyethylene, as a melt or in solution, with maleic anhydride.  The interpolymers are derived from a major proportion of an acrylic or substituted acrylic ester and a minor proportion of other monomers such as styrene, acrylonitrile or acrylic acid. The resin may be an alcohol or acid modified rosin, shellac, casein or phenol/formaldehyde resin or a maleic acid adduct of styrene or a methacrylate.  Suitable polysiloxane-oxyalkylene block copolymers may be prepared by reacting a siloxane polymer containing a silicon-bonded, halogen-substituted monovalent hydrocarbon group and an alkali metal salt of an oxyalkylene polymer, or by heating a polysiloxane containing a hydrogen-siloxy group with an alkenyloxy terminated oxyalkylene polymer in the presence of a platinum catalyst.  The compositions may also comprise non-ionic emulsifiers, e.g. alkylene oxide adducts of fatty alcohols and alkyl phenols.  An example describes a polish formulation comprising polyolefin wax emulsion, ethyl acrylate/acrylonitrile/styrene interpolymer emulsion, alkali-soluble resin, diethylene glycol monoethyl ether, tributoxyethyl phosphate and a silicone block copolymer.
Patent GB-1408898-A (GB)
Title: Foldable caravan
IPC: B60P3/34
Filed: 1972-11-14
Abstract: 1408898 Collapsible caravans G J VINCE and F J VINCE 14 Nov 1972 52424/72 Heading B7B A folding caravan comprises a lid 2 hinged to an outer tray 3, and an inner tray 4 slidable from the outer tray, the arrangement being such that when the parts 2 and 4 are extended they form the caravan floor. Low wall sections 17, 18 and 19 are fitted to the parts, the sections 18 and 19 being hinged to panels 18a, 19b having curved top edges and retained in raised position by tubular members 59, 60, and 61 which support a canvas roof. Stays 73 and 74 limit the outward movement of the panels 18a, 19b and panels 43a, 44b. The interior is fitted with hinged seats, a table, work top (79) and twin burners, Fig. 7 (not shown), and wash bowl 84. A storage compartment is provided beneath the floor 3. The caravan body is mounted on a trailer provided with a tow bar and can be folded from the erect position to the collapsed position Fig. 1. In erect position, the caravan is stabilized by adjustable retractable ground engaging feet, the opened lid 2 also being provided adjustable stabilizers provided within a baggage rack secured to the top of the lid.
Patent GB-1121603-A (GB)
Title: Improvements in or relating to spraying booms
IPC: A01M7/00
Filed: 1964-12-28
Abstract: 1,121,603. Spraying booms. H. W. WESTON. 23 Dec., 1965 [28 Dec., 1964], No. 52539/64. Heading A1D. A spraying boom for mounting on a tractor comprises beams 17 pivotally mounted in a support 4 so that they can pivot rearwardly on hitting an obstruction, the support 4 being pivotally mounted by a pin 15 on a centre-section 1 and movement of the support 4 about the pin 15 being damped by hydraulic shock absorbers 26. Adjustable ground engaging skids are mounted on the beams and are just clear of the ground when the beams are at the normal spraying height. The beams are held in the support 4 by means of spring clips 16.
Patent GB-1088909-A (GB)
Title: Improvements in or relating to processes for the continuous casting of tubular products
IPC: B22D11/00
Filed: 1964-12-30
Abstract: 1,088,909. Continous casting process. GEBR. BOHLER & CO. A.G. Dec. 30, 1964 [Jan. 16, 1964], No. 52776/64. Heading B3F. Tubular metal products are continuously cast by withdrawing the casting from the mould 3 along an initially descending and then ascending curved path to a level at which the liquid core of the casting is in hydrostatic equilibrium and at a withdrawal rate sufficiently high that the liquid metal remains inside the casting at that level as pouring and withdrawal of the casting is continued. The skin of the leading end of casting is opened or cut off at the level 7, e.g. by a cutting torch 6. The level to which the liquid core will rise may be effected by variation of the pressure above the melt in the mould. The liquid core may be agitated, e.g. by mechanical vibrators or electromagnetic means.
Patent GB-1449505-A (GB)
Title: Liquid treatment equipment
IPC: B01D17/028
Filed: 1973-11-14
Abstract: 1449505 Inclined tube liquid-solids separator ECODYNE Ltd 14 Nov 1973 [17 Nov 1972] 52841/73 Heading BID Parallelepipedal blocks of inclined tubes for a liquid-solids separator (Figs. 1, 2 not shown) each comprise a stack of extruded flat or corrugated, metal or plastics members which each have ribs 6 extending from one side and secured in grooves in or on the opposite side of an adjacent member. In Fig. 10 widened edges of ribs 6 engage in grooves defined by flanges 29 and are bonded therein by welding, adhesive or solvent-welding. In Fig. 12 arrow section rib edges 41 make a friction fit in grooves 3. Alternative forms are illustrated in Figs. 3, 11, 13, 14 and 15. Ribs 6 can be of uniform thickness (Fig. 6 not shown), but if provided with edge enlargements these are offset on the outer ribs of a member (Fig. 4, not shown), and the upper member of a stack has no ribs (Fig. 9, not shown). Members are cut at an angle from a continuously extruded section to enable the tubes to be inclined at 60 degrees to horizontal (Fig. 1). A plurality of stacks may be assembled in parallel in one tank with a clean liquid overflow (25). Members may be aluminium, stainless steel, polyvinylchloride, polypropylene or A.B.S. with ultraviolet inhibitor and 0.010-0.030 ins. thick. Tubes may be 2 ins. square and 24 ins, long.
Patent GB-1154217-A (GB)
Title: Apparatus for Measuring the Height of the Surface of a Liquid
IPC: G01F23/16
Filed: 1966-11-25
Abstract: 1,154,217. Indicating liquid level. PILKINGTON BROS. Ltd. and J.J. JAGO. Nov.22, 1967 [Nov.25, 1966], No.52988/66. Heading G1H. In a device for indicating the surface height of a liquid such as molten glass, a hollow probe 29 having an inclined lever end, is supplied with air under pressure from a tube 11 through a regulator 31, a restrictor 32, a vessel 33 and a flexible tube 34 and the arrangement is such that as the probe end 37 is moved towards the liquid level L-L, by air pressure, supplied from tube 11 through a regulator 12, restrictor 13, a solenoid valve 14, a vessel 23, and a pipe 24, acting on a spring loaded piston 26, the air pressure in the probe 29 increases, as the probe 29 nears or immersed in the liquid to a pre-determined value to cause a switch 41 to actuate solenoid valves 14, 19. The valve 14 on actuation terminates the air supply to tube 15 and connects tube 15 to an exhaust 16 so that the cylinder 25 begins to exhaust and the spring 27 raises piston to lift probe 29 clear of the liquid surface. The air pressure, when the probe 29 is clear of the liquid surface, escapes to atmosphere and the air pressure in vessel 33 falls to a pre-determined minimum and the switch 41 deenergizes valves 14, 19. The valve 19 when energized, terminates the air supply through tubes 15, 18, restrictor 20 and a vessel 21 to an indicator such as a pressure recorder 22. When switch 41 is again de-energized valves 14, 19 due to the elivation of probe 29 the valve 14 connects the air supply to tube 15 to instigate a further sensing cycle and the valve 19 opens to place the indicator in communication with the cylinder 25. The lower end of the probe 29 may be provided with a number of notches or vertical slids. The probe 29 may alternatively be fixed to obtain an indication of the liquid reaching a predetermined level.
Patent GB-1255786-A (GB)
Title: Hardened hydrophilic colloid compositions
Inventor: BURNESS DONALD MACARTHUR
IPC: G03C1/30
Filed: 1968-11-08
Abstract: 1,255,786. Unsaturated sulphonyl compounds. EASTMAN KODAK CO. 8 Nov., 1968 [13 Nov., 1967], No. 63119/68. Heading C2C. [Also in Division G2]  HOCH 2 CH 2 SNa is reacted With CICH 2 CH 2 - OCH 2 CH 2 Cl to give (HOCH 2 CH 2 SCHCH 2 ) 2 O which is then oxidized with H 2 0 2  to (HOCH 2 - CH 2 SO 2 CH 2 CH 2 ) 2 0 which is in turn treated with SOCl 2  to give (ClCH 2 CH 2 SO 2 CH 2 CH 2 ) 2 0 which is dehalogenated with Et 3 N in tetrahydrofuran to give (CH 2  = CHSO 2 CH 2 CH 2 ) 2 0. (ClCH 2 CH 2 SO 2 CH 2 CH 2 CH 2 CH 2 ) 2 O and (CH 2  CHSO 2 CH 2 CH 2 CH 2 CH 2 ) 2 0 are prepared similarly. (CH 2  = CHSO 2 CH 2 CH 2 ) 2 NCH 2 CH 2 CH 3  is prepared from CH 2  = CHSO 2 CH = CH 2  and CH3- CH 2 CH 2 NH 2 . The vinylsulphonyl compounds are used as photographic hardeners.
Patent GB-1336194-A (GB)
Title: Method of and apparatus for cleaning molten metal contaiminated with dross
IPC: C03B18/18
Filed: 1971-11-17
Abstract: 1336194 Float glass process SARATOVSKY FILIAL GOSUDARSTVENNOGO NAUCHNO-ISSLEDOVATELSKOGO INSTITUTA STEKLA MINISTERSTVA PROMYSHLENNOSTI STROITELNYKH MATERIALOV SSSR 17 Nov 1971 [23 Nov 1970] 53346/71 Heading C1M [Also in Division C7] Molten metal, such as that used in the bath during the float glass process, which is contaminated with dross is cleaned by feeding the molten metal 3 into a vessel 1, rotating the metal in the vessel to form a cavity in which the dross 9 accumulates, removing the dross accumulated in the cavity from the vessel, and removing clean metal from a region of said vessel in which the dross does not accumulate. The metal is rotated by a magnetic field set up by an inductor 2 which surrounds the vessel 1. The metal is continuously fed through a passage 4 into the vessel 1 and the cleaned metal overflows the brim of the vessel into a trough 7. The dross 9 falls down a  tube 13 and into a hopper 11. The vessel 1 together with the trough 7 make up a hermetically sealed space in which a protective gas atmosphere at above atmospheric pressure may be maintained above the molten metal in the vessel 1.
Patent GB-1480345-A (GB)
Title: Vehicle lamps
IPC: F21V23/06
Filed: 1973-11-17
Abstract: 1480345 Vehicle lamps LUCAS ELECTRICAL Ltd 18 Sept 1974 [17 Nov 1973] 53474/73 Heading F4R [Also in Division H2] In a vehicle headlamp comprising, Fig. 1, a body 11 for attaching to the vehicle and a lamp unit adjustably mounted relative to the body and wherein the lamp unit comprises a support 12 and a light unit 13, the light unit 13 including a reflector having a lens element secured thereto and being detachably secured to the support 12, the rear connector of the light unit mates with a complementary connector on the vehicle wiring harness and the two connecting parts are held together by a retaining spring 18a, Fig. 3, formed from flat strip. The ends 19, 20 of the spring are riveted to the sealed beam light unit 13 and the central portion 21 is curved into a U-shape, this region being surrounded by insulating material 22 and engaging the complementary connector in use to prevent it from becoming disconnected from the light unit connector.
Patent GB-1311930-A (GB)
Title: Protective sleeve for a cable joint
IPC: H02G15/113
Filed: 1970-11-11
Abstract: 1311930 Cable joints WILHELM QUANTE  SPEZIALFABRIK FUR APPARATE DER  FERNMELDETECHNIK and WALTER ROSE KG 11 Nov 1910 [11 Nov 1969 23 April  1970] 53648/70 Heading H2E A protective sleeve for a cable joint, Fig. 1, comprises a pair of casing shells 1, 1<SP>1</SP>, e.g. of thermosetting plastics material, secured together by bolts 2 through flanges 3, the abutting margin portions being grooved to accommodate a thermosetting sealing composition in the form of a cord, a water-vapour barrier 21, comprising a metal foil and a thermoplastics material film, embedded in the shell walls and a thickened wall portion 16 in at least one shell for earthing pins 17 or pressure-gauge nipples. The earthing pin contacts a metal foil 18. The sealing grooves terminate near the cable inlet apertures at packing 4, defined by the discs 5, 5<SP>1</SP> in grooves 20. A stainless steel cable support ring 7 causes the slit cable sheath to be pressed on the inside shell wall 8 when the sleeve is closed. Armouring 11 is located on the cable by wire binding 10 and extends over the sleeving to be secured by clip 14. Recess 15 allows the excess armouring to be cut off easily. Pockets may be provided between the flanges 3, 3<SP>1</SP> to accept two metal plates, one of which has a threaded hole, the other acting as a backing plate, to jack the seal open by screwing a bolt through said hole, Fig. 3 (not shown). For end-to-end joints, Fig. 4, the sealing groove 38 extends into channel 40. On closing the housing the packing 4 and the sealing compound are brought into contact through the  grooves 20 the packing 4 being squeezed out of  groove 40 into groove 20. The packing also  extends across the bridge 39 in the form of a sheet 41 when the sleeve is assembled. The water-vapour diffusion barrier is included in the shell during the pressing operation, and may be provided with longitudinal folds prior to pressing Fig. 7 (not shown). The thermoplastic film is recessed from the foil edge and the foil is arranged so as to form the base of the sealing grooves. Rams, Fig. 10 (not shown), may be used to locate the foil and the shell material during the pressing operation. A protective coating may be formed on the sleeve by a layer of powder or provided by galvanizing, sintering &c.
Patent GB-1153459-A (GB)
Title: Press for Manufacturing Covered Buttons.
Inventor: ZACK ANDRE
IPC: A44B1/12
Filed: 1966-11-30
Abstract: 1,153,459. Assembling buttons. A. ZACK. 30 Nov., 1966 [22 Dec., 1965], No. 53676/66. Heading A3H. A press ror manufacturing covered buttons comprises a fixed base 9, carrying a magazine 11, a die 12 and a press head sleeve 3, the head sleeve being provided with two punches 6, 7 which are brought simultaneously and respectively to bear on the magazine and the die when a press lever 2 is lowered, and with a movement transmitting mechanism interposed between the stem of the press lever and the punches to bring about their horizontal rotation by a quarter turn when the lever of the press is raised. As the punches descend to pick up a shell and a piece of fabric on the magazine 11 and to assembly the shell and piece of fabric with a cover on the die 12, a projection on a pin 25 on the end of the lever stem slidable within the sleeve 3 engages the upper surface of the punch 7 causing it to descend further than the punch 6 to retain the shell and fabric within the head. At each up and down movement of the punches they are turned through 90 degrees by means of a pin projecting inwardly of the sleeve 3 and engaging in a shaped slot in a coaxial, rotatable hollow shaft 14 supporting the punches. At each downward movement of the lever a button is assembled and after each upward movement the magazine and die are fed respectively with a piece of fabric and shell and a cover. By multiplying the numbers of punches, magazines and dies more than one button can be produced by each downward operation of the lever.
Patent GB-1495285-A (GB)
Title: Rolling process
IPC: G03G15/10
Filed: 1974-12-11
Abstract: 1495285 Die rolling XEROX CORP 11 Dec 1974 [17 Dec 1973] 53678/74 Addition to 1434131 Heading B3M A pattern is impressed in a cylindrical work roll 1 by a rolling die 2 while the roll 1 is supported by a backing roll 2 having a resilient abrasion-resistant surface. The roll 2 may have a layer of, for example, polyurethane, polyisoprene, polybutadiene, nylon or natural rubber, adhering to a metal core. The roll 1, which may be used for applying a liquid developer to an electrically charged photoreceptive surface, may be impressed with a trihelicoid thread pattern of 180 to 240 threads per inch having a depth of 35 to 65 microns. The roll may be of 9 inch length, 1 inch diameter, and be made from, e.g. aluminium, copper, or mild steel. A conventional thread rolling machine, in which the die 2 and roll 3 replace the normal dies, may be employed.
Patent GB-1096558-A (GB)
Title: Improvements relating to outer panelling of vehicles
IPC: B60R13/06
Filed: 1966-12-06
Abstract: 1,096,558. Vehicle bodies. DAIMLER-BENZ A.G. Dec. 6, 1966 [Dec. 7, 1965], No. 54486/66. Heading B7B. The openings formed by the corrugated external panelling 6 adjacent a doorway &c. are closed by a resilient strip or strips 12 held compressed by an angle-piece 11.
Patent GB-1298020-A (GB)
Title: 3-halo-2,6-dinitro-4-trifluoromethylanilines
IPC: A01N43/34
Filed: 1970-11-16
Abstract: 1298020 Substituted 2,6 - dinitroanilines UNITED STATES BORAX & CHEMICAL CORP 16 Nov 1970 [19 Nov 1969] 54507/70 Heading C2C The invention comprises compounds of formula wherein X is halogen; and R 1 , R 2  are each alkyl, alkenyl or alkynyl, their halo, hydroxy or C 1-6  alkoxy derivatives, or their cyclic analogues, or R 1  may be H, or NR 1 R 2  is a heterocyclic ring. These compounds are prepared by reacting a 2,4-dihalo-3,5-dinitrobenzotrifluoride with R 1 R 2 NH. The compounds of the above formula, as well as the 2,6-dinitro-4-trifluoromethylphenylene-1,3-diamines (II) prepared from them by treatment with NH 3  or a primary or secondary amine, are stated to have herbicidal properties. In Example X, unsubstituted II is isolated in the latter reaction, using NH 3 .
Patent GB-1446229-A (GB)
Title: Enzyme of hydrolytic action enzymatic preparation methods for  preparing both and their uses
IPC: C12N9/52
Filed: 1973-11-23
Abstract: 1446229 Enzymatic treatment of hides LENINGRAD NI INST ANTIBIOTIKOV OMUTNIN KHIMICHE ZAVOD and LENINGRAD PROIZVODSTVENNO-KHOZYAISTVENNOE OBIEDINENIE KOZHEVENNYKH PREDPRIYATY 23 Nov 1973 54591/73 Heading C6C [ Also in Divisions C2 C3 and A5] Animal hides are softened as a preliminary treatment to dehairing by the application of an aqueous solution of protohygrolytin, a crude enzyme extract of the enzyme hygrolytin obtained from the culture medium of a hygrolytin producing strain of the microbiological species Streptomyces hygroscopicus, e.g. S hygroscopicus strain No. 1913 (deposit No. 997 of the All-Union Research Institute for Antibiotics, Moscow) (see Division -C3). The hides may be treated with ammonium sulphate before addition of the enzyme.
Patent GB-1404794-A (GB)
Title: Doppler pulse radar receivers
IPC: G01S13/524
Filed: 1972-11-28
Abstract: 1404794 Pulse radar SIEMENS AG 28 Nov 1972 [29 Nov 1971] 54904/72 Heading H4D In a pulse Doppler radar receiver incorporating selective weighting means 12, preceding the input to the M.T.I. filter 15, the weights are adjusted such that the gradient of the rise and/or fall flank of the echo pulse envelope is reduced. Spurious response as the aerial beam moves through a fixed target is thereby reduced. In the embodiment the coherent video echo signals are digitized 11, before weighting and filter 15 is digital. The weighting coefficients may be taken from a store 13 which is programmed to operate from a beam-switching means 4 or may be a computer 14. A suitable weighting function is given.
Patent GB-1408049-A (GB)
Title: Reforming petroleum hydrocarbons with catalysts promoted with gallium and rhenium
IPC: C10G35/06
Filed: 1972-11-30
Abstract: 1408049 Reforming catalysts STANDARD OIL CO 30 Nov 1972 [17 Dec 1971] 55283/72 Heading B1E [Also in Division C5] Catalysts comprise a hydrogenation component, 0.05-3 wt% Re and 0.05-3 wt% Ga based on the weight of the composition supported on a porous, refractory oxide. The hydrogenation component is preferably a Group VIII metal and the catalysts may be halided.
Patent GB-1456617-A (GB)
Title: Conveyors
IPC: B65G19/02
Filed: 1974-12-23
Abstract: 1456617 Conveyers LOUIS. SCHIERHOLZ KG 23 Dec 1974 [31 Dec 1973] 55369/74 Heading B7L A conveyer comprises trolleys 2 for carrying mail bags along a track 1 which has passages 7 for free running of the trolleys and ascending passages 8 with succeeding sections 8a, 8b of increasing slope for upward movement of the trolleys by pusher members 10 of a drive chain 9, the chain 9 being guided from section 8a to steeper section 8b by a wheel 16 which at its circumferential edge has recesses 17 to receive portions of the trolleys 2 projecting beyond the chain 9 and to thus allow movement of trolleys so received from section 8a to 8b. A respective further recess 18 is provided in advance of each recess 17 so that a trolley which is propelled by a pusher member 10 may push an abutting foregoing trolley which has its projecting portions accommodated in recess 18.
Patent GB-1418378-A (GB)
Title: Injection blow moulding method and apparatus for hollow article having openings at both ends
IPC: B29C49/48
Filed: 1973-12-03
Abstract: 1418378 Injection-blow-moulding NISSEI PLASTICS INDUSTRIAL CO Ltd 3 Dec 1973 [4 Dec 1972] 55950/73 Heading B5A Hollow articles having openings at both ends are formed by injection-blow-moulding by firstly injection-moulding a parison with openings at both ends in a mould having coaxial movable and stationary core members, moving the parison on the movable core member to an open blow-mould, closing the blow-mould, closing the open end of the parison previously occupied by the stationary core member with a further movable core member and blowmoulding the parison. As shown in Fig. 5, the injection mould 1 comprises outer, split parts 1a, (1b), with stationary core 2a and movable core 2b. The hollow, cylindrical parison 3 is injection moulded in cavity 3 by device 8. Platens 18 are opened, opening the injection mould 1 and blow-mould 11 and support 6 is retracted by cylinder 21 and rotated by 180 degrees by motor 22 before being advanced and the platens 18 closed so that parison 3 is enclosed in blow-mould 11. A further core 16 is advanced by member 13 to close the remaining open end and the parison is blow-moulded in cavity 12 by air supplied through core 16. Central flash portion (9a) is removed on blowing. The article, which may be a bellows (Fig. 6a, not shown) or a lamp chimney (Fig. 6b, not shown) or a globe for a desk lamp and may be screw-threaded at one or both ends, may be removed from core 16 on mould-opening.
Patent GB-1201972-A (GB)
Title: Flush valve tripping device
IPC: E03D5/092
Filed: 1968-11-28
Abstract: 1,201,972. Flush valve tripping device. TWENTIETH CENTURY PRODUCTS CORP. 28 Nov., 1968 [30 Nov., 1967], No. 56490/68. Heading E1C. An outlet valve 4 of a WC cistern is operated by turning handle 21 which turns a spindle 18 fitted in bushing 15 and which in turn operates crank 19 (which may be integral with the spindle). Link 28 is pivotally fixed to the crank 19 at one end and is weighted at its other end e.g. by enlarged portion 37, thus crank 19 on rotation turns link 28 which pulls flexible cord 13 and thereby lifts valve 4. Cord 13 may be looped through slot 32 and round hook 37. The weighted end of the link causes return of the handle. The operating parts may be made of plastics and the cord of glass.
Patent GB-1334868-A (GB)
Title: Cyclopen-tane-tetracarboxylic acid
IPC: C07C61/06
Filed: 1970-12-01
Abstract: 1334868 Cyclopentane-tetracarboxylic acid containing polyesters PRODUITS CHIMIQUES PECHINEY-SAINT-GOBAIN 1 Dec 1970 [3 Dec 1969] 57034/70 Heading C3R [Also in Division C2] An alkyd resin composition comprises an alkyd resin already partially esterified and condensed but containing free OH groups in admixture with cyclopentane-tetracarboxylic acid consisting of the isomer melting at about 160‹ C. and giving a tetramethyl ester prepared by esterifying a solution of the acid with a solution of diazomethane in known manner, said ester having absorption spectrum bands of 9À6-9À75-9À90-10À55-11À20-12À03 and 14À50 microns wavelengths. An example is given in which such a composition is prepared and tested.